Introspection method lacks in
UGC NET - 2012, UGC NET - 2013,
Answer: D
Introspection lacks reliability, validity and objectivity, so all three are correct. It is a private observation of one's own mental states, so another person cannot check it (no objectivity), different observers or the same one on different occasions give different reports (low reliability), and the act of introspecting changes the mental state studied (poor validity).
Options A, B and C name only one of the three deficiencies each. The key is D, all the three.
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